lib/Target/Mips/MipsTargetMachine.cpp

   1 //===-- MipsTargetMachine.cpp - Define TargetMachine for Mips -------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // Implements the info about Mips target spec.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "Mips.h"
  15 #include "MipsTargetAsmInfo.h"
  16 #include "MipsTargetMachine.h"
  17 #include "llvm/Module.h"
  18 #include "llvm/PassManager.h"
  19 #include "llvm/Target/TargetMachineRegistry.h"
  20 using namespace llvm;
  21
  22 /// MipsTargetMachineModule - Note that this is used on hosts that
  23 /// cannot link in a library unless there are references into the
  24 /// library.  In particular, it seems that it is not possible to get
  25 /// things to work on Win32 without this.  Though it is unused, do not
  26 /// remove it.
  27 extern "C" int MipsTargetMachineModule;
  28 int MipsTargetMachineModule = 0;
  29
  30 // Register the target.
  31 static RegisterTarget<MipsTargetMachine>    X("mips", "Mips");
  32 static RegisterTarget<MipselTargetMachine>  Y("mipsel", "Mipsel");
  33
  34 const TargetAsmInfo *MipsTargetMachine::
  35 createTargetAsmInfo() const
  36 {
  37   return new MipsTargetAsmInfo(*this);
  38 }
  39
  40 // DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
  41 // The stack is always 8 byte aligned
  42 // On function prologue, the stack is created by decrementing
  43 // its pointer. Once decremented, all references are done with positive
  44 // offset from the stack/frame pointer, using StackGrowsUp enables
  45 // an easier handling.
  46 // Using CodeModel::Large enables different CALL behavior.
  47 MipsTargetMachine::
  48 MipsTargetMachine(const Module &M, const std::string &FS, bool isLittle=false):
  49   Subtarget(*this, M, FS, isLittle),
  50   DataLayout(isLittle ? std::string("e-p:32:32:32-i8:8:32-i16:16:32") :
  51                         std::string("E-p:32:32:32-i8:8:32-i16:16:32")),
  52   InstrInfo(*this),
  53   FrameInfo(TargetFrameInfo::StackGrowsUp, 8, 0),
  54   TLInfo(*this)
  55 {
  56   // Abicall enables PIC by default
  57   if (Subtarget.hasABICall())
  58     setRelocationModel(Reloc::PIC_);
  59
  60   // TODO: create an option to enable long calls, like -mlong-calls,
  61   // that would be our CodeModel::Large. It must not work with Abicall.
  62   if (getCodeModel() == CodeModel::Default)
  63     setCodeModel(CodeModel::Small);
  64 }
  65
  66 MipselTargetMachine::
  67 MipselTargetMachine(const Module &M, const std::string &FS) :
  68   MipsTargetMachine(M, FS, true) {}
  69
  70 // return 0 and must specify -march to gen MIPS code.
  71 unsigned MipsTargetMachine::
  72 getModuleMatchQuality(const Module &M)
  73 {
  74   // We strongly match "mips*-*".
  75   std::string TT = M.getTargetTriple();
  76   if (TT.size() >= 5 && std::string(TT.begin(), TT.begin()+5) == "mips-")
  77     return 20;
  78
  79   if (TT.size() >= 13 && std::string(TT.begin(),
  80       TT.begin()+13) == "mipsallegrex-")
  81     return 20;
  82
  83   return 0;
  84 }
  85
  86 // return 0 and must specify -march to gen MIPSEL code.
  87 unsigned MipselTargetMachine::
  88 getModuleMatchQuality(const Module &M)
  89 {
  90   // We strongly match "mips*el-*".
  91   std::string TT = M.getTargetTriple();
  92   if (TT.size() >= 7 && std::string(TT.begin(), TT.begin()+7) == "mipsel-")
  93     return 20;
  94
  95   if (TT.size() >= 15 && std::string(TT.begin(),
  96       TT.begin()+15) == "mipsallegrexel-")
  97     return 20;
  98
  99   if (TT.size() == 3 && std::string(TT.begin(), TT.begin()+3) == "psp")
 100     return 20;
 101
 102   return 0;
 103 }
 104
 105 // Install an instruction selector pass using
 106 // the ISelDag to gen Mips code.
 107 bool MipsTargetMachine::
 108 addInstSelector(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
 109 {
 110   PM.add(createMipsISelDag(*this));
 111   return false;
 112 }
 113
 114 // Implemented by targets that want to run passes immediately before
 115 // machine code is emitted. return true if -print-machineinstrs should
 116 // print out the code after the passes.
 117 bool MipsTargetMachine::
 118 addPreEmitPass(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
 119 {
 120   PM.add(createMipsDelaySlotFillerPass(*this));
 121   return true;
 122 }
 123
 124 // Implements the AssemblyEmitter for the target. Must return
 125 // true if AssemblyEmitter is supported
 126 bool MipsTargetMachine::
 127 addAssemblyEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
 128                    bool Verbose, raw_ostream &Out)
 129 {
 130   // Output assembly language.
 131   PM.add(createMipsCodePrinterPass(Out, *this, OptLevel, Verbose));
 132   return false;
 133 }